An astronaut throws a basketball across the ship. The force pushes the astronaut backwards as well.
Mr. Van Wey pushes down on the gym floor hard with his feet. The floor pushes
him back and he moves upwards to dunk the basketball.

(Write your own example of pushing on an object and the object pushing back
for N3L.)

3:23 AM

Aquarterback pedals 3.3meters southward and then run 5.7meters northward. whats the distance ? and whats the displacement?

In the first law of thermodynamics, triangle e=q-w, what does q stand for

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.